java 单例的创建
单例在读取配置文件是经常使用
public class ReadConf{
private static ReadConf instance;
private Map<String,String> dataMap = new HashMap<>();
public static ReadConf getInstance(){
if(instance == null){
instance = new ReadCondf();
}
return instance;
}
public Map<String,String> getMap(){
return this.dataMap;
}
public void readConf(){
//读取内容
}
}